In the 1920s, the USPS placed giant concrete arrows every ten miles across the United States to guide pilots along the first transcontinental air mail routes. Hundreds still exist (though they've lost their bright yellow paint and night beacons). LOVE. And MUST FIND.
Real - Pura Lempuyang Door, Bali, Indonesia - This image is sometimes marked as fake but it is real. Usually seen from the point of view shown in the top image. The other images show various viewpoints and span several years and different seasons.